Microsoft Windows allows the creation of an "IPv6-in-IPv4 point-to-point tunnel":

>netsh interface ipv6 add v6v4tunnel "My Tunnel"

My question is: what protocol is this?

i know netsh exposes access to other tunneling or IPv6 transition protocols:

What protocol is v6v4tunnel implementing?

The reason i ask is because there's no documentation from Microsoft; so reading an RFC will have to be my documentation.

See also


v6v4tunnel is a simple 6in4 tunnel, using IPv6 in IPv4 proto-41 packets as defined in RFC 4213 ("host-to-router"). Sometimes this is called a "Protocol 41" tunnel.

This tunnel type is used by Tunnelbroker and other IPv6 tunnel providers. The Linux equivalent is a sit tunnel interface.

portproxy is a transport-layer proxy that listens for TCP connections and relays them to the configured destinations, similar to how 6tunnel works on Linux.

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